Did people see this, possibly via DPI’s Facebook page?https://www.dpi.nsw.gov.au/about-us/media-centre/releases/2021/the-great-winburndale-trout-translocation
I had mixed feelings about it. The article is carefully crafted but are we still portraying trout in an undue bad light here? A quick exchange with Secretary Central Acclimatisation Society relaxed me. (CAS are Affiliated to NSWCFA same as we are) .
Brown trout are somewhat piscivorous and it was only sensible to reduce the numbers in an impoundment where they were of no benefit to recreational fishing, thereby maximising the survival chances of the Macquarie Perch fry, and putting the trout where they will be a benefit to rec fishing.
We’ll probably repeat that yearly for the next few years.
It’s all about population dynamics. In the 4 years or so until they reach sexual maturity the Perch need the scales tilted their way. After that it might be interesting to see whether the two species coexist but I think that experiment might better wait until there are more recovering populations of the Perch.”
When I asked if the electrofishing was also used to remove redfin, Don responded.
There are no redfin in the Dam, which is why it was chosen for the Macquarie Perch, and hopefully will remain that way. The redfin are so inimical to the Perch that there’s no point reintroducing the Macquaries where redfin are present or are likely to turn up.
Further, the redfin are such hardy prolific breeders that there probably would not be much point trying to reduce their numbers using the approach we took with the trout, a reflection of the degree of threat each represents. DPI see removal of some of the browns as an exercise in abundant caution.
A couple of interesting reflections arising from the exercise:
Anglers are not permitted to enter the area for health reasons, the Dam being for potable water supply, yet the indications were that quite a significant number of wild pigs lived in the area, which is bounded by a nature reserve. Given all the diseases that wild pigs host, it’s rather contradictory of the concern re anglers.
I had the opportunity observe the use of a calibrated electric shock to stun a fair number of trout of various sizes, fingerlings to 5lb stonkers, which were netted and held captive; all recovered within a few minutes, as did a few Macquarie Perch fry that were incidentally caught and released. Having seen this, I have no concerns about the use of electro fishing for research purposes on fish, including trout.
By the way, Ray Tang Wallerawang CAS organised the development, stocking and eventual opening of the Millpond, an old quarry at Portland with the aid of the Portland Trust.
Don provided some extra photos.
